fix: Implicit conversion from float to int loses precision

Author: kenjis

system/Images/Handlers/GDHandler.php

@@ -451,7 +451,7 @@ protected function textOverlay(string $text, array $options = [], bool $isShadow
          * Get the rest of the string and split it into 2-length
          * hex values:
          */
-        $opacity = ($options['opacity'] * 127);
+        $opacity = (int) ($options['opacity'] * 127);
 
         // Allow opacity to be applied to the text
         imagealphablending($src, true);

tests/system/Images/GDHandlerTest.php

@@ -289,7 +289,10 @@ public function testFitPositions()
     public function testText()
     {
         $this->handler->withFile($this->path);
-        $this->handler->text('vertical', ['hAlign' => 'right', 'vAlign' => 'bottom']);
+        $this->handler->text(
+            'vertical',
+            ['hAlign' => 'right', 'vAlign' => 'bottom', 'opacity' => 0.5]
+        );
         $this->assertSame(155, $this->handler->getWidth());
         $this->assertSame(200, $this->handler->getHeight());
     }